Technically this is off topic but the larger issue at hand is personal responsibility or lack thereof. It seems that it's way too common these days that players don't take the effort to do any research and rather have the expectation that things will be just handed to you.
Yes the internet has lots of information these days but even then, enough research would yield the generally "correct" strategy for bosses in WoW Raids across most difficulties. However, the OP's post merely wants to cut through all that work for a "simple" 3 line or less explanation for tanks (which BTW is fine for LFR). But could you imagine people wanting a 3 line or less explanation for tanks in Mythic?
If anything, BRF has shown several fights (at least in normal or higher difficulties) that personal responsibility for doing the mechanics properly is key. Unfortunately, that is beyond the scope of the OP question, however, the baseline is still there that people should do a little digging before asking.